单项选择题
A.does
B.did
C.had done
D.was doing
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单项选择题
A.thoseB.thisC.theseD.them
A.those
B.this
C.these
D.them
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单项选择题
A.underB.onC.withD.without
A.under
B.on
C.with
D.without
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